One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,6)(3,4,8,7)(9,10,15,19)(11,16,20,23)(12,17,21,22)(13,14,18,24)(25,26)(27,33)(28,31)(29,34)(30,36)(32,37)(35,39)(38,40)(1,2)(3,7)(4,8)(5,6)(9,11,15,20)(10,16,19,23)(12,13,21,18)(14,22,24,17)(25,27)(26,30)(28,35)(29,36)(31,38)(32,39)(33,34)(37,40)(1,2)(3,7)(4,8)(5,6)(11,20)(12,21)(16,23)(17,22)(25,28,29,37)(26,31,34,32)(27,35,36,40)(30,38,33,39)(2,6)(4,7)(9,12,15,21)(10,17,19,22)(11,13,20,18)(14,23,24,16)(25,28)(26,32)(27,35)(29,37)(30,39)(31,34)(33,38)(36,40)(1,3)(2,7)(4,6)(5,8)(9,13)(10,14)(11,21)(12,20)(15,18)(16,22)(17,23)(19,24)(25,27)(26,33)(28,35)(29,36)(30,34)(31,39)(32,38)(37,40) involution — undirected(1,4,5,7)(2,8,6,3)(9,14)(10,18)(11,22)(12,16)(13,19)(15,24)(17,20)(21,23)(25,26)(27,30)(28,31)(29,34)(32,37)(33,36)(35,38)(39,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.